Recently I had a quarrel with a group moderator about submitting a photomanip. The photo manip met all formal requirements of the group (use of proper stock pictures, giving credit to all stock used) still he rejected the submission because he didn't like WHAT I drew. He told me this in really rude words and even said, my photomanip would be no art at all. That hurt a lot. And it made one thing clear to me, that until now, I only knew in theory:

If you deny other art works to be displayed, you break the universal right of Freedom of Speech. Then you can't claim this rule for your own art.